AMC DSP 88 User manual

IMPORTANT SAFETY INSTRUCTIONS
When using this electronic device, asic
precautions should always e taken,
including the following:
1. Read all instructions before using the product.
2. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement or
near a swimming pool etc).
3. Use this device when you are sure that digital signal processor has a stable base and it is fixed securely.
4. his product, in combination with loudspeakers and amplifier may be capable of producing sound levels
that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level or
at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should consult
with otorhinolaryngologists. he product should be positioned so that proper ventilation is maintained.
5. he product should be located away from heat sources such as radiators, heat vents, or other devices
(including amplifiers) that produce heat.
6. he product should be connected to a power supply that is described in the operating instructions or
are marked on the product. Replace the fuse only with one of the specified type, size and correct rating.
7. he power supply cord should be undamaged and never share an outlet or extension cord with other
devices so that the outlet or extension cord's power rating is exceeded. Never leave device plugged into the
outlet when it is not being used for a long period of time.
8. Care should be taken so that objects do not fall into, and liquids would not be spilled through, the
enclosure's openings.
9. he product should be serviced by qualified service personnel if:
• he power supply cord or the plug has been damaged.
• Objects have fallen into or liquid has been spilled on the product.
• he product has been exposed to rain.
• he product has been dropped or the enclosure damaged.
10. here are some areas with high voltage inside, to reduce the risk of electric shock do not remove cover of the
device. he cover should be removed by the qualified personnel only.
No user servicea le parts inside.

CON EN S:
Before you start
Introductions 4
Features 4
Operation
Front panel 5
Rear panel 5
Function description 6
Powering up the device 7
Operating the channel menus 8
Operating the system menus 13
Quick Reference 18
PC Control Software 19
Firmware upgrade 23
Specifications
General specifications 24

Introduction
he DSP 88 is a digital loudspeaker management system designed for the touring or fixed sound installation
markets. he absolute latest in available technology is utilized with 40-bit floating point processors and high
performance 24-bit Analog Converters. he high-bit DSP prevents noise and distortion induced by
truncation errors of the commonly used 24-bit fixed-point devices. A complete set of parameters include I/O
levels, delay, polarity, 8 bands of EQ per channel, 31 bands of GEQ per input, multiple crossover selections
and full function limiters. Precise frequency control is achieved with its 1 Hz resolution. Inputs and outputs
can be routed in multiple configurations to meet any requirement. he DSP 88 can be controlled or
configured in real time on the front panel or with the intuitive AMC DSP Software Control accessed via the
RS-232, USB or Ethernet interface. Software upgrade for CPU and DSP via PC keeps the device current with
newly developed algorithms and functions once available. Multiple setup storage and system security
complete this professional package.
Features
• Up to 8 inputs and 8 outputs with flexible routing.
• 40-bit floating point DSP.
• 96 kHz sampling rate.
• High performance 24-bit A/D converters.
• 1 Hz frequency resolution.
• 8 equalizers for each input and output.
• 31 bands GEQ for each input.
• Multiple crossover types with full function limiters.
• Precise level, polarity and delay.
• CPU and DSP upgrade via PC.
• Individual channel buttons with linking capability.
• 2-Line x 16 character backlit LCD display.
• Full 5-segment LED’s on every Input and output.
• Storage of up to 30 preset setups.
• Security lock.
• Ethernet, USB and RS232 Interface for PC control and configuration.
• Mic preamps + phantom Power for each input.

Front Panel
1. USB connector
2. RS232 connector
3. Mute (channel button)
4. Audio signal meter
5. Channel menu LED
6. LCD display
7. Menu buttons
8. Rotary selector
Rear Panel
1. Power connector with power switch and AC
fuse ( 2,5AL 250V)
2. Ethernet connector
3. Balanced universal Phoenix outputs
4. Balanced universal Phoenix inputs

Functions description
USB
his is a standard ype B USB connector. Device driver from the provided software CD must be installed
prior to usage.
RS232
his is a standard female DB \9 socket. A straight through cable is required for PC connection.
Mute (Channel Menu) Buttons
his button is for mute or un-mute input and output channel. When an input channel is muted, a red LED
comes on for indication. When the <<Menu or Menu>> key is held down, the Mute Buttons selects the
corresponding channel for the LCD menu display and is acknowledged by a green LED below the button.
he last modified menu will be displayed on the LCD. Multiple channels can be linked or unlinked by
pushing the desired channels. his eases programming for same parameters across multiple channels.
Multiple Inputs can be linked together and multiple outputs can be linked together. Inputs and Outputs are
linked separately.
Channel Menu LED
Menu LED indicates the activated channels for data modification.
Peak Level LED
Peak LED indicates the current peak level of the Signal: Signal, -12dB, -6dB, -3dB, Over/Limit. he Input Limit
LED references to the device's maximum headroom. he Output Limit LED references to the threshold of
the output limiter.
LCD
Display shows all the necessary information to control the unit.
Menu Buttons
here are 6 menu keys:
<<Menu
Go to previous menu screen. Holding this button down while pressing Mute key you go to the specify
channel menu.
Menu>>
Go to next menu screen. Holding this button down while pressing Mute key you go to the specify channel
menu.
<<Cursor
Go to previous cursor in the menu screen.
Cursor>>
Go to next cursor in the menu screen.
Enter/Sys
Enter/Sys is used only in the System Menu to proceed with selected actions. Sys enters the System Menu
from the main menu.
Exit
Exit to the Main Menu.
Rotary Thum Wheel
Rotary thumb wheel changes parameter data values. he wheel has travel velocity sensing which ease large
incremental data modifications. For modifying delay and frequency (1 Hz resolution), pressing the Enter/Sys
key simultaneously will increment/decrement the data value by 100 times.

Main Power
Connects via a standard IEC socket. A compatible power cord is supplied with the unit.
Main Fuse
2.5A-250V. Slow blow type.
Power switch
Controls power On/Off.
Ethernet
his is RJ45 connector for Ethernet control. he device should be connected to a router/switch/hub via a
straight through CA -5 cable.
Analog Inputs and Outputs
Separate phoenix connectors are provided for each audio input and output. he device's output stage
employs the balanced impedance topology.
Powering up the device
After powering up the unit, the following initialization screen is displayed on the LCD
he initialization process takes several seconds and during that period the unit boots and displays the
device model and firmware version. After the initialization process is finished the XP displays its main screen:
he screen shows the current program number and program name assigned to the unit. If the program
number ends with *, it means that no program is assigned, the last data before previous power down is
recalled instead.

Operating the channel menus
Please hold the Menu >> button and then, press the mute button of the input or output channels if you
want to activate the channel menu.
Channel Linking – while holding down the <<Menu or Menu>>, more than 1 channel from the same group
(Input or Output group) can be selected to link the channels together. he green LEDs below the Mute
buttons are lit for the linked channels. Any modification of the data for the selected channel will be applied
to the linked channels as well. o cancel the linking, simply deselect the desired channel while the <<Menu
or Menu>> key is still pressed, or just press the Exit key to deselect all channels.
Input microphone gain
he level (or gain) ranges from 0dB to +45dB in 3dB steps. his level will only have an affect on the input
channel when MIC Input is selected from the System Menu.
Input / output signal
LEVEL: he level (or gain) ranges from -40.00dB to +15.00dB in 0.25dB steps.
POL: he polarity (or phase) can be normal (+) or inverted (-).
DELAY: he maximum delay permitted is 650ms, in steps of approximately 10us. It can be displayed in ms,
ft or m. he time unit of the delay is set in the system menu.

Input / output equalizer
EQ#: Each input channel has 8 bands of equalization. his control selects one of the 8 available bands.
BYPASS: his control will un-bypass (Off) or bypass (On) the currently selected band.
TYPE: he 5 types of EQ that can be used are: parametric (PEQ), low shelf (LOSHF), high shelf (HI-SHF), 1st
degree all-pass (AP-1), and 2nd degree all pass (AP-2).
FREQ: he EQ center frequency ranges from 20Hz to 30kHz in either 1Hz steps or 1/36 octave steps. he
frequency steps can be selected in the system menu.
BW: he EQ bandwidth ranges from 0.02 to 3.61 octaves in steps of 0.01 octave. he equivalent Q value
automatically shows besides the octave value. For 1st degree all-pass (AP-1) filter, the bandwidth
sets the phase shift at the centre frequency. his phase shift is gradually changed from 180degrees
above the centre frequency to the specified value.
LEVEL: he EQ level (or gain) ranges from -30.00dB to +15.00dB in 0.25dB steps.

Input graphic equalizer
GEQ#: he graphic equalizer has 31 bands of equalization from 20Hz to 20kHz. his control selects one of
the 31 available bands. he frequency corresponding to each band is also shown.
LEVEL: he GEQ level (or gain) ranges from -30.00dB to +15.00dB in 0.25dB steps.
BYPASS: his control un-bypass (Off) or bypass (On) the entire GEQ for this channel.
Input / output crossover
TYPL: he 3 available filter types for the low frequency crossover point (high pass) are: Butterworth,
Linkwitz Riley or Bessel.
FRQL: he filter cuts-off frequency for the low frequency crossover point (high pass) ranges from 20 to
30kHz in either 1Hz steps or 1/36 octave steps. he frequency steps can be selected in the
System’s Menu.
SLPL: he filter slope for low frequency crossover point (high pass) ranges from 6to 48dB/octave. he
available slopes are 12, 24, 36 or 48 dB/octave.